Bus (+) & Bus (-) Shorted Together
- Turn ignition switch to OFF position. Disconnect Powertrain Control Module (PCM) harness connector C3. See COMPONENT LOCATIONS . Turn ignition switch to ON position. Using scan tool, select SYSTEM MONITORS, then CCD BUS TEST. If scan tool displays BUS (+) & BUS (-) SHORTED TOGETHER, go to next step. If scan tool does not display BUS (+) & BUS (-) SHORTED TOGETHER, replace PCM. See POWERTRAIN CONTROL MODULE under REMOVAL & INSTALLATION. Perform BODY VERIFICATION TEST under VERIFICATION TESTS.
- Turn ignition switch to OFF position. Disconnect instrument cluster harness connector. Turn ignition switch to ON position. If scan tool displays BUS (+) & BUS (-) SHORTED TOGETHER, go to next step. If scan tool does not display BUS (+) & BUS (-) SHORTED TOGETHER, replace instrument cluster. See INSTRUMENT PANELS - CHEROKEE article. Perform BODY VERIFICATION TEST under VERIFICATION TESTS.
- Turn ignition switch to OFF position. Disconnect Transmission Control Module (TCM) harness connector, if equipped. See Figure . Turn ignition switch to ON position. If scan tool displays BUS (+) & BUS (-) SHORTED TOGETHER, go to next step. If scan tool does not display BUS (+) & BUS (-) SHORTED TOGETHER, replace TCM. See TRANSMISSION CONTROL MODULE under REMOVAL & INSTALLATION. Perform BODY VERIFICATION TEST under VERIFICATION TESTS.
- Turn ignition switch to OFF position. Disconnect Compass/Mini-Trip Computer (CMTC) harness connector, if equipped. Turn ignition switch to ON position. If scan tool displays BUS (+) & BUS (-) SHORTED TOGETHER, go to next step. If scan tool does not display BUS (+) & BUS (-) SHORTED TOGETHER, replace CMTC. See COMPASS/MINI-TRIP COMPUTER under REMOVAL & INSTALLATION. Perform BODY VERIFICATION TEST under VERIFICATION TESTS.
- Turn ignition switch to OFF position. Disconnect Remote Keyless Entry (RKE) module harness connector, if equipped. Turn ignition switch to ON position. If scan tool displays BUS (+) & BUS (-) SHORTED TOGETHER, go to next step. If scan tool does not display BUS (+) & BUS (-) SHORTED TOGETHER, replace RKE module. See REMOTE KEYLESS ENTRY MODULE under REMOVAL & INSTALLATION. Perform BODY VERIFICATION TEST under VERIFICATION TESTS.
- Turn ignition switch to OFF position. Disconnect Sentry Key Immobilizer Module (SKIM) harness connector. See Figure . Turn ignition switch to ON position. If scan tool displays BUS (+) & BUS (-) SHORTED TOGETHER, go to next step. If scan tool does not display BUS (+) & BUS (-) SHORTED TOGETHER, replace SKIM. See SENTRY KEY IMMOBILIZER MODULE under REMOVAL & INSTALLATION. Perform BODY VERIFICATION TEST under VERIFICATION TESTS.
- Turn ignition switch to OFF position. Disconnect negative battery cable and wait 2 minutes. Disconnect Air Bag Control Module (ACM) harness connector. See COMPONENT LOCATIONS . Connect negative battery cable. Turn ignition switch to ON position. If scan tool displays BUS (+) & BUS (-) SHORTED TOGETHER, go to next step. If scan tool does not display BUS (+) & BUS (-) SHORTED TOGETHER, replace ACM. See AIR BAG CONTROL MODULE under REMOVAL & INSTALLATION. Perform BODY VERIFICATION TEST under VERIFICATION TESTS.
- Turn ignition switch to OFF position. Disconnect scan tool from Data Link Connector (DLC). Measure resistance between terminals No. 3 (Violet/Brown wire) and No. 11 (White/Black wire) at DLC. See Fig 1 . If resistance is less than 100 ohms, repair short between Violet/Brown wire and/or White/Black wire. Perform BODY VERIFICATION TEST under VERIFICATION TESTS. If resistance is 100 ohms or greater, repair or replace scan tool cable or scan tool as necessary. Perform BODY VERIFICATION TEST under VERIFICATION TESTS.
WARNING:
DO NOT reconnect battery before turning ignition switch to ON position and ensuring no one is in vehicle. Air bag may deploy.
NOTE:
Disconnect battery and wait 2 minutes before disconnecting Air Bag Control Module (ACM). If ACM is dropped, it must be replaced.
NOTE:
All control modules must be disconnected from CCD bus circuit to perform test.